crystal reports barcode formula EDITING FILES IN PLACE in Font

Maker DataMatrix in Font EDITING FILES IN PLACE

CHAPTER 25 EDITING FILES IN PLACE
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#!/bin/sh usage="$0 {target file containing any special characters to be escaped}" if [ $# -eq 0 ] then echo $usage exit 1 fi if [ ! -f $1 ] then echo File $1 does not exist echo $usage exit 1 else file=$1 fi
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If these requirements aren t met, the script displays the usage information and exits. The following code starts the here-document for input to the ed command:
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ed -s $file <<EOF g/[\]/s/[\]/\\\\\\\/g
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The first search and replace is for the escape character itself. This replacement must be first or it will replace the backslash of characters that have already been escaped. These replacements are the most simple of the bunch:
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g/ /s/ /\\\ /g g/!/s/!/\\\!/g g/@/s/@/\\\@/g g/#/s/#/\\\#/g g/,/s/,/\\\,/g g/%/s/%/\\\%/g
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This grouping of replacements could have been written with the search character being surrounded by square brackets instead of the double escape. There isn t any difference in the length of the lines and it can be written either way.
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g/\\$/s/\\$/\\\\$/g g/\\&/s/\\&/\\\\&/g g/\\*/s/\\*/\\\\*/g
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The following set of replacement characters doesn t work with the search character surrounded by square brackets. They must be escaped so they aren t interpreted by the shell.
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g/\\;/s/\\;/\\\;/g g/\\:/s/\\:/\\\:/g g/\\[/s/\\[/\\\[/g g/\\]/s/\\]/\\\]/g g/\\^/s/\\^/\\\\^/g g/\\\`/s/\\\`/\\\\\`/g
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CHAPTER 25 EDITING FILES IN PLACE
This large section of replacements demonstrates the search character being specified by containing it within the square brackets. The replacement is still an escaped value.
g/[/]/s/[/]/\\\\//g g/[(]/s/[(]/\\\(/g g/[)]/s/[)]/\\\)/g g/[+]/s/[+]/\\\+/g g/[=]/s/[=]/\\\=/g g/[{]/s/[{]/\\\{/g g/[}]/s/[}]/\\\}/g g/[|]/s/[|]/\\\|/g g/[']/s/[']/\\\'/g g/["]/s/["]/\\\"/g g/[<]/s/[<]/\\\</g g/[>]/s/[>]/\\\>/g g/[ ]/s/[ ]/\\\ /g g/[~]/s/[~]/\\\~/g g/[-]/s/[-]/\\\-/g g/[_]/s/[_]/\\\_/g
The script finally completes by closing the here-document. This finishes the input to the ed command, and the modifications are then made to the input file.
w q EOF
Evaluating Variables in a Flat File
ne common scripting technique is to create a flat file that is one of a potential number of canned messages for users to receive messages such as notifications of downtimes, changes in the environment, or use of system quota. (I consider a flat file simply a file that contains text.) Based on the logic in the script, the proper message will be sent to the user or users. A more advanced implementation of this technique provides a template that refers to environment variables and contains customizable elements so the message can be tailored specifically to the recipient. In 36, I present a script that checks every morning for user passwords that are aging and therefore should be changed. In that script, when a password has reached the predetermined cut-off age, the script sends an e-mail to the account owner to state that the account will be locked if the owner doesn t update her password. The script annoys the user every day for a couple of weeks, after which the account is locked. After that, if the user wants to use the account she would have to call and explain why she didn t heed the friendly e-mail warnings. The canned template file looks like this:
$ENVIRONMENT account password for \\"$USERID\\" expires in $REMAINING day\\(s\\) ============================================================== ++ ACTION NEEDS TO BE TAKEN OR YOUR ACCOUNT WILL BE LOCKED ++ ++ IN $REMAINING day\\(s\\) ++ ============================================================== If the password isnt changed within $REMAINING day\\(s\\), account will be locked. Instructions for changing passwords are located at: \\<a href=\\"http://server.company.com/chg_passwd.html\\"\\> http://server.company.com/chg_passwd.html\\</a\\> If you are unable to change your password, please call the Help Desk.
CHAPTER 26 EVALUATING VARIABLES IN A FLAT FILE
If you no longer need this account, please let us know so we can remove it. System Administration
Note in particular the shell variables (ENVIRONMENT, USERID, and REMAINING) and their escape sequences. When the script executes, the account expiration date for each possible USERID is checked, and the script determines how many days REMAINING there are before the account is frozen. The ENVIRONMENT variable specifies the environment from which the message is being sent. The occurrences of these variables must be replaced with their values before the script is run and the message is sent. Likewise, each escape sequence \\ evaluates to a single backslash that causes the following special character to be escaped so that it is treated as plain text when the script executes. For each user with a soon-to-expire password, the template file is evaluated at runtime to replace the included variables with their contents. The code to perform the replacements in each case is fairly simple. It consists of one small loop that looks at each line in the flat file and replaces any variables with their assigned values. You can easily modify the code for other purposes for example, to display the modified file.
cat $flat_file | while read a_line do place_holder=`eval echo $a_line` echo $place_holder done | $MAIL -s "$ENVIRONMENT UNIX Account Notification" $RECIPIENT
The loop processes each line of the file using the eval statement, which causes the variables to be replaced with their string values. The expanded line is assigned to the variable place_holder so that it can be echoed to standard output. Once all lines have been processed, the complete output is sent via e-mail to the specified RECIPIENT by the e-mail command in the final element of the command pipeline. The specific e-mail command is up to you; a couple of common ones are mailx and mail, depending on your operating system. This technique has many potential uses. The example script here is much like a traditional mail merge where you customize the message based on specific users. You could also use this technique for creating and maintaining configuration for an application, or custom files for individual users patterned after a default file.
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